York > Eboracum Yorkshire United Kingdom

…fortified York.

Constantine, after making his way through the territories of the hostile Severus, crosses together with his father to Britain, where they fight a campaign in the north before Constantius' death in a victory over the Picts at Eboracum (present York) on July 25, 306; his troops immediately proclaim Constantine emperor.

The Anglo-Saxons under Ælla conquer Deira from the Britons.

Ælla becomes the first king of Deira.

Edwin, installed on Æthelfrith’s vacant throne by Raedwald, becomes king not just of Deira but of Bernicia as well.

His reign marks the domination of Northumbria as leading Anglo-Saxon state of the British Isles.

The Angles under Edwin of Northumbria invade Rheged ("Old North") in Northern England and expel king Llywarch Hen.

He flees to Powys and becomes a famous bard.

Edwin's armies fight also against Gododdin and Strathclyde.

King Edwin marries Æthelburga of Kent, who, as a Christian, brings her personal chaplain, Paulinus, and encourages her husband to convert to Christianity.

Edwin defeats the West Saxons under Cynegils, who has tried to thwart the growing strength of Edwin by having him assassinated.

Edwin obliges Cynegils to acknowledge Northumbria's supremacy.

Paulinus, last of the missionaries sent to England by Pope Gregory I, builds a wooden church in the old Roman legionary headquarters in York and baptizes Edwin of Northumbria as the first Christian king in Northern England, triggering the initial phase of the conversion of the pagan north.

King Edwin of Northumbria refortifies the city walls of York, possibly including the building of the so-called Anglian Tower, a small square tower built of stone with arched doorways and tunnel-vaulted.

…Osric taking power in Deira.

Osric according to Bede, was, like Eanfrith, a Christian who reverted to paganism upon coming to power.